Battery unit



FIG. 1 is a top plan view of a battery unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof, the left side elevational view thereof being a mirror image except for the fittings on the top; and,

FIG. 6 is a front, top and left side perspective view thereof. 

The ornamental design for a battery unit, as shown and described. 